I could not find headphones for ages for a 2005 xc90 and at last after trying several volvo dealers and quotes of £150 each, i have found soem that work!
They are Panasonic RP-WF810 headphones purchased from Amazon for £28 - just tune them in and away you go!
Phew!!!
http://www.amazon.co.uk/exec/obidos/...A3P5ROKL5A1OLE